Design of an in vivo cleavable disulfide linker in recombinant fusion proteins.

Design of an in vivo cleavable disulfide linker in recombinant fusion proteins.
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DOI:
10.2144/000113450
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发表时间:
2010-07
期刊:
影响因子:
2.7
通讯作者:
Shen WC
Shen WC
中科院分区:
工程技术4区
文献类型:
--
作者:
Chen X;Bai Y;Zaro JL;Shen WC

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In order to achieve an optimal biological activity and desired pharmacokinetic profiles, a dithiocyclopeptide linker was designed for in vivo release of protein domains from a recombinant fusion protein. This novel in vivo cleavable disulfide linker, based on a dithiocyclopeptide containing a thrombin-sensitive sequence and an intra-molecular disulfide bond, was inserted between transferrin and granulocyte colony-stimulating factor recombinant fusion protein domains. After expression of the fusion protein, G-C-T, from HEK293 cells, thrombin treatment in vitro generated a fusion protein linked via a reversible disulfide bond that was quickly cleaved in vivo, separating the protein domains. After release from the fusion protein, free G-CSF exhibited an improved biological activity in a cell proliferation assay. Although reversible disulfide bonds are commonly used in protein chemical conjugation methods, to our knowledge this report is the first example of the construction of a recombinant fusion protein with a disulfide linkage for the release of the functional domain. This linker design can be adapted to diverse recombinant fusion proteins where in vivo separation of protein domains is required to achieve an improved therapeutic effect, and a desirable pharmacokinetic profile and biodistribution, of the functional domain.
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